i have an 89 crx hf that i just bought and im about to put a d16z6 in it. im gonna use the exhaust mani and downpipe from a 91 crx si. the cat on an hf is 2" off the header not down farther in the exhaust system like other models. will i be able to put the header in there from the si and have it match up to the stock hf exhaust, and if so how would i get a cat in there or do i just have to weld one in?

 

come on no ones ever put a different motor in an hf?